2 Samuel 4:1

And when Saul’s son heard that Abner was dead in Hebron, his hands were feeble, and all the Israelites were troubled.

Abner's death in Hebron left Saul's son Ishbosheth with feeble hands and left all the Israelites troubled. That weakness made clear that Saul's kingdom could not be maintained much longer, for Ishbosheth's power was already waning. His subsequent murder by his own captains completed the downfall of Saul's house.